Olaf Scholz - ReutersIn a guest article for the Sunday paper, extracts from which were made available on Saturday, Scholz fleshed out proposals that he was considering jointly with France to make it harder for international firms to evade tax.

Both countries are seeking ways to ensure that firms like Amazon, Apple and Google pay domestic taxes in proportion to the profits they earn in Europe's largest markets, though attempts to harmonise tax rates across the European Union have met stiff resistance from lower-tax members like Ireland.

"We need a worldwide minimum tax level that no state may go below," Scholz said in the article, adding that any such rules would need to be accompanied by measures to make it harder to move money into tax havens.

Scholz said the internet economy "was exacerbating a problem that we recognise from globalisation and that we are trying to address: the placing of profits in low-tax locations."

Germany, Europe's largest consumer market, is particularly fertile ground for U.S.-based internet giants, many of which have used offshore structures to minimise their tax exposure to what remains a relatively high-tax economy.